Abstract
We have observed the first-order melting transition for the first time in twinned NdBa2Cu307-y single crystal that was previously thought to be a non-stoichiometric system. The transition displays a ‘kink‘ in resistance and a jump in magnetization. The V-I characteristics in field exhibit a characteristic S shape behavior at the melting transition. We observed the hysteresis in magnetoresistance near the kink region. We obtain mass anisotropy, γ=5.9 and c L =0.6 consistent with the melting criterion. The magnetic phase diagram obeys the melting scaling.. This is the first observation of a first-order melting transition in a system other than YBCO containing magnetic rare-earth ions. Our results clearly demonstrate that NdBCO single crystal, grown by flux method under reduced partial oxygen pressure, behaves as a “clean“ superconductor.
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Shibata S et al (to be published)
Pradhan A K et al (submitted)
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© 1999 Springer Japan
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Pradhan, A.K., Shibata, S., Nakao, K., Koshizuka, N. (1999). Observation of the First-Order Vortex Lattice Melting in NdBa2Cu3O7-y Single Crystals. In: Koshizuka, N., Tajima, S. (eds) Advances in Superconductivity XI. Springer, Tokyo. https://doi.org/10.1007/978-4-431-66874-9_51
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DOI: https://doi.org/10.1007/978-4-431-66874-9_51
Publisher Name: Springer, Tokyo
Print ISBN: 978-4-431-66876-3
Online ISBN: 978-4-431-66874-9
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